I went into hammer and played around little, here are some stuff i would fix
Put a playerclip above the whole map so people cant fly everywhere (just copy paste the skybox roof and drag it down and make it playerclip,
Increase the height of all the player clips so it clips into the playerclip in the roof so boosted zombies cant stand on the playerclips
Fix the wall thingy easy fix
maybe fix the nodraws if you want
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